US6556844B1 - Process for transmitting data, in particular GSM data - Google Patents

Process for transmitting data, in particular GSM data Download PDF

Info

Publication number
US6556844B1
US6556844B1 US09068155 US6815598A US6556844B1 US 6556844 B1 US6556844 B1 US 6556844B1 US 09068155 US09068155 US 09068155 US 6815598 A US6815598 A US 6815598A US 6556844 B1 US6556844 B1 US 6556844B1
Authority
US
Grant status
Grant
Patent type
Prior art keywords
data
transmitting
transcoder
data stream
signal parameters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09068155
Inventor
Ralf Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KAROLS DEVELOPMENT CO LLC
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date
Family has litigation

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18Service support; Network management devices
    • H04W88/181Transcoding devices; Rate adaptation devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1867Arrangements specific to the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W36/00Handoff or reselection arrangements
    • H04W36/08Reselecting an access point

Abstract

A data stream between transcoders of a mobile wireless system is subdivided into a first data stream with samples for transmission and a second data stream with signal parameters for reconstruction of user data and/or for signaling. Both data streams are transmitted at the same time permitting an improvement in the quality of transmitted data, e.g. speech data in a GSM network in tandem operation between mobile subscribers.

Description

FIELD OF THE INVENTION

The present invention relates to a method of transmitting data, in particular GSM data, between at least two subscribers.

BACKGROUND INFORMATION

With previous GSM data circuits, in particular for digitized speech data between mobile stations over a communication network, such as the public telephone system (PSTN—public switched telephone network), GSM data in GSM format has been converted by a transcoder to the frame format of the communication network (64 kbit/s PCM for PSTN). With the DMCS 900 mobile wireless system, such transcoding takes place at the base stations or at the A interface in transfer to the PSTN communication network. According to GSM Recommendation 0860/0861, digital speech transmission takes place in TRAU frames (TRAU=transcode and rate adaptor unit), i.e., transmission frames in 16 kbit/s format for FR (full rate) transmission and 8 kbit/s or 16 kbit/s for HR (half rate) transmission.

U.S. Pat. No. 5,091,945 describes that instead of speech data, it is possible to transmit only signal parameters (speech parameters) from which the user data can be reconstructed.

SUMMARY OF THE INVENTION

According to the present invention, an improvement is achieved in the quality of the data transmitted, specifically GSM speech data, in particular in tandem operation with connections between mobile stations. Due to the simultaneous transmission of samples, e.g., PCM values, and signal parameters for reconstruction of the speech data, this reduces interference when using a transcoder that is not equipped for tandem-free operation with transparent switching of TRAU frames. Even when identification information is transmitted, speech data is still transmitted in the first data stream.

The present invention also improves handover operation. The present invention can be implemented easily in existing systems. Only the speech transcoders of a network are affected. For example, of the 8 bits per speech sample, the two least-significant bits are replaced by a TRAU frame (speech is then reduced to 6 bits) into which identification information and/or synchronization information can be inserted to synchronize the transcoders.

By squeezing the lowest-order bits to zero in transmission of speech samples when establishing a voice connection, the speech quality is improved.

In a handover, i.e., when changing to another transcoder, frame loss can be ascertained rapidly, and it is possible to prevent invalid frames from being processed further as TRAU frames. A transcoder that is not equipped for tandem-free operation can process speech samples during a synchronization operation. If a reduced idle pattern is sent instead of samples after synchronization is concluded, the speech decoder of the transcoder can be switched off or used for other purposes, e.g., for full rate/half rate code conversion in the downlink path.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an exemplary call connection between two stations according to the present invention.

FIG. 2 shows the data of an exemplary transmission interface in chronological sequence according to the present invention.

FIG. 3 shows the patterns used in FIG. 2.

FIG. 4 shows an exemplary handover operation according to the present invention.

DETAILED DESCRIPTION

In the existing GSM network (fixed network side), e.g., the DMCS 900 network, transcoding—i.e., recoding the speech data from the given TRAU (transcode and rate adaptation unit) format according to GSM Recommendation 08.60 to the transmission format of the communication network, e.g., the public telephone network PSTN (PCM values in the 64 kbit/s frame format)—is always performed.

Subscriber T11 initiates a connection with subscriber T12. The transcoding device, hereinafter always referred to as a transcoder, TCE1 assigned to subscriber TL1 sends identification in the traffic channel of the A interface A-IF, signaling to transcoder TCE2 (tandem-) thus connected that it is a transcoder capable of TFO (tandem-free operation). The two transcoders switch to TFO after they have recognized this signal and then exchange speech parameters. If the transcoder encounters a non-TFO-capable transcoder, it will not receive the identifier of the remote station within a certain period of time and therefore will return to normal operation in which it codes and decodes the speech (speech samples).

The interfaces of transcoders TCE1, TCE2 with subscribers T11, T12, which can be connected over fixed wireless stations BTS, for example, are designated as ATER-IF. Switching between transcoders is designated as MSC.

Connecting a Call

When connecting a call, detection of the transfer at the A interface (A-IF) in the two lower (least significant) bits of the A samples from 00 to ≠00 represents the trigger. The trigger may optionally be delayed by Ttrigger.

This trigger condition is selected so as to comply with the following performance of the switching equipment MSC:

a) The MSC sends a non-busy transcoder an IDLE pattern.

b) In the handshake, the MSC first switches a loop between the input and output of the line to the transcoder before it switches through.

c) The MSC switches the two directions through at different rates. This can be equalized with Ttrigger.

Arbitration Procedure

Transcoder TCE1 then sends a TRAU frame (which has previously been used for transmission between the wireless station and transcoder and contains signal parameters for reconstruction of user data) in the least significant two bits of these samples instead of the usual 8 bit PCM samples to the A-IF interface. The data stream between transcoders TCE1 and TCE2 is then subdivided into a first data stream with samples (PCM values) and a second data stream with signal parameters, specifically TRAU frames. Both data streams are transmitted at the same time, in particular during a handshake phase. In such a TRAU frame, TRAU* identification information is sent for a predetermined period of time. As soon as the TRAU* has been recognized by the remote station, they switch to TFO. This process is monitored by a timer Tsync. When it runs out, they switch to normal operation.

As an alternative, n, n<9 bits for signaling can also be used with any desired frame structures.

As an alternative, the TRAU* identification information can be omitted and only the TRAU frame synchronization information used.

As long as the synchronization Tsync is running, the TRAU frames arriving from the Ater-IF are sent in the least significant two bits of A-IF following the TRAU* identification information. This permits immediate transfer to TFO in the remote station after receipt of the TRAU* identification information. The more significant six bits of the samples are filled with the processed more significant six bits PCM*. This reduces the quality loss if the remote station is not a TFO-capable transcoder.

If no TRAU* is received within a repeat time Trepeat (Trepeat<Tsync), a TRAU* is sent again. The purpose of this second TRAU* is described in the handover case.

TFO (Tandem-free Operation)

After recognizing the TRAU* at the A-IF, the following TRAU frames (contents) are subsequently sent through to Ater-IF. Adaptation of the control bits and timing of the Ater-TRAU frame is adapted to the local conditions. Non-relevant frames from the remote station (BFI=1, TRAU*) are replaced by a preceding frame and muting is optionally initiated. Any jitter in the TRAU frame length of ±2 bits must also be compensated. Codec conversions, DTX and muting functions are also performed in this direction. The advantage is that no signaling is necessary during the conversation if local conditions change.

In the opposite direction, TRAU frames are sent transparently from the Ater-IF to the A-IF. The upper six bits are then replaced by IDLE* (010101) instead of PCM*. This makes it possible to switch off the transcoder function, because this capacity may be needed for the HRC←→FRC conversion in an FR/HR system environment. It also avoids additional operating time. TRAU frames with data content can also be sent through transparently.

Instead of IDLE*, a modulo-n counter can also be installed, permitting even more reliable error detection.

Handover

The handover case is subdivided into the three cases described below.

a) Handover to a TFO-capable Transcoder

First, termination of the incoming TRAU frames is recorded and a timer Trelease is started. After a certain period of time, the transcoder again receives a TRAU* from the newly connected transcoder TCE2, stops Trelease, sends a TRAU* itself and remains in TFO. The transcoder can thus remain in TFO continuously.

If the first TRAU* cannot be received, because the switching MSC has not yet switched through, its second TRAU* is detected, however, and results in TFO.

To detect the handover from transcoder TCE2 to transcoder TCE3 as rapidly as possible and not trigger on a loop on the A-IF, the newly connected transcoder TCE3 (FIG. 4) will send “PCM+” during the handshake. “PCM+” is PCM data with the lower two bits at ‘00’ so as not to simulate TRAU sync bits. This permits suppression of interference at the subscriber's end.

b) Handover to a Non-TFO-capable Transcoder

First, termination of the incoming TRAU frames is recorded and a timer Trelease is started. Timer Trelease runs out and the transcoder returns to the arbitration state in which it encodes the incoming data at the A-IF. It attaches PCM samples “PCM*,” which are now decoded, to the TRAU frames in the outgoing data stream at A-IF. The TRAU sent first is a TRAU*. Timer Tsync is started. Since no TRAU* had been received before timer Tsync ran out, the transcoder returns to normal operation.

c) Handover from a Non-TFO-capable Transcoder

If the previous remote station was not TFO-capable, the transcoder cannot recognize the handover. For the new remote station, however, it is a normal handshake in which it first sends a TRAU* if it is TFO-capable. The transcoder receives it, likewise sends a TRAU* and goes into TFO mode. If the switching is delayed, the first TRAU* is lost and the second TRAU* after Trepeat leads to success.

Termination of Call

The end of a call is initiated either by termination of the TRAU frames on the Ater-IF or by detected errors on the A-IF. The sequence is then the same as in the case of the above-described “handover to a non-TFO-capable transcoder.”

Behavior When There are Errors in TFO

a) Individual Errors on the A-IF

Individual errors cannot be recognized in the data bits of the TRAU frame. Individual errors can be recognized only in the synchronization bits of the TRAU frames. No measures can be derived from this because there is no information regarding the data bits of the TRAU frame.

b) Burst Error on the A-IF

Routing TRAU frames with a great deal of interference to the Ater-IF means that severe interference noise may occur at the subscriber's end. Therefore, when a single error is detected, a burst error is assumed, the remaining TRAU frame is discarded and replaced by the TRAU frame sent previously. The following measures largely prevent such interference:

1. Double error monitoring procedure:

1.1 by monitoring the (TRAU) frame synchronization,

1.2 by monitoring the IDLE* pattern in the upper six bits, as an alternative to 1.2: monitoring by a periodic pattern, e.g., of a modulo-n counter, whose counts are transmitted in the first data stream.

2) Error Masking Buffer

A buffer with approximately x ms (5 ms here) allows storage of the data up to the last TRAU sync bit and replacement by the last valid data in the event of an error.

If the burst is very long, the transcoder switches to normal operation as in the case of the above-described “handover to a non-TFO-capable transcoder.”

Claims (22)

What is claimed is:
1. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching; and
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions;
wherein the data is GSM data.
2. The method according to claim 1, wherein the predetermined operating conditions include at least one of a handshake phase, a handover phase, and an error phase.
3. The method according to claim 1, wherein the signal parameters of the second data stream are transcoding rate adaption unit frames for mobile wireless systems.
4. The method according to claim 1, wherein the first data stream includes a first set of more significant bits of a parallel bit sequence, and the second data stream includes a second set of less significant bits of the parallel bit sequence.
5. The method according to claim 4, further comprising the step of forming the second data stream by reducing data of the first data stream.
6. The method according to claim 4, further comprising the step of transmitting the set of more significant bits as PCM samples.
7. The method according claim 1, further comprising the step of transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber.
8. The method according to claim 7, further comprising the steps of:
transmitting only the samples during the handshake phase; and
inserting zero sequences instead of the signal parameters.
9. The method according to claim 7, further comprising the step of switching the second transcoder assigned to the called subscriber to a tandem-free operation after receiving the identification information from the first transcoder assigned to the calling subscriber.
10. The method according to claim 7, further comprising the step of transmitting a periodic idle pattern instead of the samples after switching to a tandem-free operation.
11. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data; and
transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber, wherein the step of transmitting identification information includes,
transmitting only samples during the handshake phase, and
inserting zero sequences instead of the signal parameters, wherein the zero sequences are inserted before the identification information.
12. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data; and
transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber, wherein the signal parameters are transmitted in a transcoding rate adaption unit frame immediately after transmitting the identification information.
13. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data;
transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber;
transmitting a periodic idle pattern instead of the samples after switching to a tandem-free operation; and
recording one of a termination of a connection and a transmission error by one of detecting transcoding rate adaption unit frame synchronization information and monitoring the periodic idle pattern.
14. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching, and wherein the signal parameters of the second data stream are transcoding rate adaption unit frames for mobile wireless systems;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data; and
recording one of a termination of a connection or a transmission error by one of detecting one of a transcoding rate adaption unit frame synchronization and analyzing a periodic pattern.
15. The method according to claim 14, wherein the periodic pattern is information of a modulo-n counter, and wherein counts of the modulo-n counter are transmitted within the first data stream.
16. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data;
transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber;
transmitting a periodic idle pattern instead of the samples after switching to a tandem-free operation;
monitoring the second data stream during the handshake phase to determine if non-zero sequences are arriving;
deriving a trigger signal from the monitoring using switching equipment located between the first and second transcoders;
sending the periodic idle pattern using the switching equipment when one of the first transcoder and second transcoder are not busy;
switching a loop in the handshake phase using the switching equipment, between an input and an output of a line to the one of the first transcoder and the second transcoder before the switching equipment switches data through to the one of the first transcoder and the second transcoder; and
compensating with the trigger signal if the switching equipment switches the data through at different rates in an input direction and an output direction.
17. The method according to claim 13, further comprising the steps of:
replacing a faulty transcoding rate adaption unit frame with a previously transmitted transcoding rate adaptation unit frame using a remote station; and
initiating a muting function.
18. The method according to claim 13, further comprising the steps of:
setting a counter when terminating the connection;
maintaining the tandem-free operation if new identification information is received from a third transcoder within a predetermined counting period;
transmitting the identification information if the new identification information is not received; and
terminating the tandem-free operation in the absence of a synchronization.
19. The method according to claim 13, further comprising the steps of:
temporarily storing last-transmitted data; and
replacing any defective data with the temporarily stored data for an error masking.
20. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data; and
transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber, wherein the step of transmitting identification information includes transmitting only samples during the handshake phase instead of transmitting both samples and signal parameters simultaneously.
21. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples for transmission and a second data stream with signal parameters for at least one of reconstructing user data and signaling, wherein the signal parameters are provided for transparent switching;
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions, wherein the data is GSM data; and
transmitting identification information instead of the signal parameters for a predetermined period of time during a handshake phase between the calling subscriber and the called subscriber, wherein the signal parameters are transmitted in a transcoding rate adaption unit frame.
22. A method of transmitting data between a calling subscriber and a called subscriber, using a predetermined frame format, comprising the steps of:
subdividing a data stream between a first transcoder assigned to the calling subscriber and a second transcoder assigned to the called subscriber into a first data stream with samples of speech data for transmission and a second data stream with signal parameters for reconstructing the speech data, wherein the signal parameters are provided for transparent switching; and
simultaneously transmitting the first and second data streams as a function of predetermined operating conditions.
US09068155 1995-11-29 1996-09-07 Process for transmitting data, in particular GSM data Expired - Lifetime US6556844B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1995144367 DE19544367A1 (en) 1995-11-29 1995-11-29 A method of transmitting data, in particular GSM data
DE19544367 1995-11-29
PCT/DE1996/001683 WO1997020440A1 (en) 1995-11-29 1996-09-07 Process for transmitting data, in particular gsm data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10424065 US6785557B2 (en) 1995-11-29 2003-04-25 Method of transmitting data, in particular GSM data

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001683 A-371-Of-International WO1997020440A1 (en) 1995-11-29 1996-09-07 Process for transmitting data, in particular gsm data

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10424065 Continuation US6785557B2 (en) 1995-11-29 2003-04-25 Method of transmitting data, in particular GSM data

Publications (1)

Publication Number Publication Date
US6556844B1 true US6556844B1 (en) 2003-04-29

Family

ID=7778623

Family Applications (2)

Application Number Title Priority Date Filing Date
US09068155 Expired - Lifetime US6556844B1 (en) 1995-11-29 1996-09-07 Process for transmitting data, in particular GSM data
US10424065 Expired - Lifetime US6785557B2 (en) 1995-11-29 2003-04-25 Method of transmitting data, in particular GSM data

Family Applications After (1)

Application Number Title Priority Date Filing Date
US10424065 Expired - Lifetime US6785557B2 (en) 1995-11-29 2003-04-25 Method of transmitting data, in particular GSM data

Country Status (8)

Country Link
US (2) US6556844B1 (en)
EP (6) EP2265085B1 (en)
JP (1) JP3847345B2 (en)
CA (1) CA2243678C (en)
DE (4) DE19544367A1 (en)
DK (5) DK2265085T3 (en)
ES (5) ES2194117T5 (en)
WO (1) WO1997020440A1 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010019958A1 (en) * 2000-02-11 2001-09-06 Eckhard Delfs Tone signalling with TFO communication links
US20020072364A1 (en) * 2000-12-13 2002-06-13 Toshiyuki Tamura Communication system and alignment method of transcoder
US20020077065A1 (en) * 2000-12-14 2002-06-20 Toshiyuki Tamura Communication system, communication method and switching node
US20020131377A1 (en) * 2001-03-15 2002-09-19 Dejaco Andrew P. Communications using wideband terminals
US20030031200A1 (en) * 2000-02-01 2003-02-13 Matti Lehtimaki Negotiation of used communication mode in a telecommunications system
US20030035501A1 (en) * 2001-08-20 2003-02-20 Hoppes Brian R. TFO resynchronization system
US20030195011A1 (en) * 1995-11-29 2003-10-16 Ralf Mayer Method of transmitting data, in particular GSM data
US6760589B1 (en) * 1998-08-19 2004-07-06 Motorola, Inc. Method and apparatus for streamlining in a communication system
US20040160950A1 (en) * 2003-02-14 2004-08-19 Nokia Corporation Method for ensuring adequacy of transmission capacity, terminal employing the method, and software means for implementing the method
US6798774B1 (en) * 1999-08-11 2004-09-28 Telefonaktiebolaget Lm Ericsson (Publ) Transcoder rate controller
US20050018769A1 (en) * 2001-12-27 2005-01-27 Karl Hellwig Transcoder-free operation in mobile communication system
US20060212289A1 (en) * 2005-01-14 2006-09-21 Geun-Bae Song Apparatus and method for converting voice packet rate
US20070121572A1 (en) * 2005-11-30 2007-05-31 Francesco Agnoni Systems and Methods for tandem free operation signal transmission
US20070230467A1 (en) * 2003-12-09 2007-10-04 Alcatel Wireless, Inc. Method and System for Packet-Based Tandem Free Operation
US20120284021A1 (en) * 2009-11-26 2012-11-08 Nvidia Technology Uk Limited Concealing audio interruptions

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2255094T3 (en) * 1996-12-04 2006-06-16 Robert Bosch Gmbh Method for data transmission, especially gsm data.
ES2375304T3 (en) * 1999-05-17 2012-02-28 Telefonaktiebolaget Lm Ericsson (Publ) Capability negotiation in a telecommunications network.
US6625164B1 (en) * 1999-07-14 2003-09-23 Qualcomm, Incorporated Selectively framing and unframing PPP packets depending on negotiated options on the Um and Rm interfaces
FR2803476B1 (en) * 1999-12-31 2003-01-10 Cit Alcatel Method for operation of tandem free establishment in a cellular mobile radio system
JP4421187B2 (en) 2000-08-21 2010-02-24 富士通株式会社 Communications system
DE10053213A1 (en) * 2000-10-26 2002-06-13 Siemens Ag A method for transmitting digital data over a plurality of data transmission networks, corresponding entities and associated program
DE60103121D1 (en) * 2001-01-22 2004-06-09 Ericsson Telefon Ab L M Connection handoff TFO mode (tandem free operation)
US20030099258A1 (en) * 2001-11-21 2003-05-29 George Calcev Method for controlling pilot power of a cell within a CDMA system
US8109349B2 (en) * 2006-10-26 2012-02-07 Schlumberger Technology Corporation Thick pointed superhard material
JP4919890B2 (en) 2007-07-11 2012-04-18 株式会社日立製作所 Radio system, base station and mobile station
WO2010003451A1 (en) * 2008-07-07 2010-01-14 Telefonaktiebolaget L M Ericsson (Publ) Method and transcoder entity for tandem free operation in a telecommunication network
US8396049B2 (en) * 2009-07-06 2013-03-12 Telefonaktiebolaget Lm Ericsson (Publ) Method and transcoder entity for tandem free operation in a telecommunication network

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924480A (en) * 1988-03-11 1990-05-08 American Telephone And Telegraph Company Codecs with suppression of multiple encoding/decodings across a connection
US5091945A (en) 1989-09-28 1992-02-25 At&T Bell Laboratories Source dependent channel coding with error protection
US5513211A (en) * 1991-09-02 1996-04-30 Nippon Telegraph And Telephone Corp Radio communication system with controlled voice code switching
US5608779A (en) * 1994-11-08 1997-03-04 Motorola, Inc. Method for communications between mobile units using single and multiple switching center configurations
US5953666A (en) * 1994-11-21 1999-09-14 Nokia Telecommunications Oy Digital mobile communication system
US5956673A (en) * 1995-01-25 1999-09-21 Weaver, Jr.; Lindsay A. Detection and bypass of tandem vocoding using detection codes

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4496920T1 (en) * 1993-09-17 1997-07-31 Motorola Inc Method and apparatus for transferring network component functions between network components
FI941125A (en) * 1994-03-09 1995-09-10 Nokia Telecommunications Oy The mobile communication system and call control method
DE4416407C2 (en) * 1994-05-09 1997-05-28 Siemens Ag Method and apparatus for transmitting voice and control signals in a digital radio system
US5768308A (en) * 1994-12-19 1998-06-16 Northern Telecom Limited System for TDMA mobile-to-mobile VSELP codec bypass
DE19600406A1 (en) * 1995-01-09 1996-07-18 Motorola Inc Generation of encrypted speech messages for digital mobile communications system contg. transcoder
US5903862A (en) 1995-01-25 1999-05-11 Weaver, Jr.; Lindsay A. Method and apparatus for detection of tandem vocoding to modify vocoder filtering
FI101439B1 (en) * 1995-04-13 1998-06-15 Nokia Telecommunications Oy Transcoder, which is a tandem coding prevention
DE19516078B4 (en) * 1995-05-05 2006-06-08 Robert Bosch Gmbh A method of transmitting data, in particular GSM data
FI98776C (en) * 1995-11-02 1997-08-11 Nokia Telecommunications Oy Adding a new speech coding method to an existing telecommunications system
DE19544367A1 (en) * 1995-11-29 1997-06-05 Bosch Gmbh Robert A method of transmitting data, in particular GSM data
ES2255094T3 (en) * 1996-12-04 2006-06-16 Robert Bosch Gmbh Method for data transmission, especially gsm data.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924480A (en) * 1988-03-11 1990-05-08 American Telephone And Telegraph Company Codecs with suppression of multiple encoding/decodings across a connection
US5091945A (en) 1989-09-28 1992-02-25 At&T Bell Laboratories Source dependent channel coding with error protection
US5513211A (en) * 1991-09-02 1996-04-30 Nippon Telegraph And Telephone Corp Radio communication system with controlled voice code switching
US5608779A (en) * 1994-11-08 1997-03-04 Motorola, Inc. Method for communications between mobile units using single and multiple switching center configurations
US5953666A (en) * 1994-11-21 1999-09-14 Nokia Telecommunications Oy Digital mobile communication system
US5956673A (en) * 1995-01-25 1999-09-21 Weaver, Jr.; Lindsay A. Detection and bypass of tandem vocoding using detection codes

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030195011A1 (en) * 1995-11-29 2003-10-16 Ralf Mayer Method of transmitting data, in particular GSM data
US6785557B2 (en) * 1995-11-29 2004-08-31 Robert Bosch Gmbh Method of transmitting data, in particular GSM data
US6760589B1 (en) * 1998-08-19 2004-07-06 Motorola, Inc. Method and apparatus for streamlining in a communication system
US6798774B1 (en) * 1999-08-11 2004-09-28 Telefonaktiebolaget Lm Ericsson (Publ) Transcoder rate controller
US20030031200A1 (en) * 2000-02-01 2003-02-13 Matti Lehtimaki Negotiation of used communication mode in a telecommunications system
US7227873B2 (en) * 2000-02-01 2007-06-05 Nokia Corporation Negotiation of used communication mode in a telecommunications system
US20010019958A1 (en) * 2000-02-11 2001-09-06 Eckhard Delfs Tone signalling with TFO communication links
US6826404B2 (en) * 2000-02-11 2004-11-30 Telefonaktiebolaget Lm Ericsson Tone signalling with TFO communication links
US20070123197A1 (en) * 2000-12-13 2007-05-31 Nec Corporation Communication system and alignment method of transcoder
US7706801B2 (en) 2000-12-13 2010-04-27 Nec Corporation Communication system and alignment method of transcoder
US7181209B2 (en) * 2000-12-13 2007-02-20 Nec Corporation Communication system and alignment method of transcoder
US20020072364A1 (en) * 2000-12-13 2002-06-13 Toshiyuki Tamura Communication system and alignment method of transcoder
US7668550B2 (en) 2000-12-13 2010-02-23 Nec Corporation Communication system and alignment method of transcoder
US20070123196A1 (en) * 2000-12-13 2007-05-31 Nec Corporation Communication system and alignment method of transcoder
US20070127357A1 (en) * 2000-12-13 2007-06-07 Nec Corporation Communication system and alignment method of transcoder
US6990340B2 (en) * 2000-12-14 2006-01-24 Nec Corporation Communication system, communication method and switching node
US20020077065A1 (en) * 2000-12-14 2002-06-20 Toshiyuki Tamura Communication system, communication method and switching node
US7289461B2 (en) * 2001-03-15 2007-10-30 Qualcomm Incorporated Communications using wideband terminals
US20020131377A1 (en) * 2001-03-15 2002-09-19 Dejaco Andrew P. Communications using wideband terminals
US20030035501A1 (en) * 2001-08-20 2003-02-20 Hoppes Brian R. TFO resynchronization system
US7158597B2 (en) * 2001-08-20 2007-01-02 Tellabs Operations, Inc. TFO resynchronization system
US20050018769A1 (en) * 2001-12-27 2005-01-27 Karl Hellwig Transcoder-free operation in mobile communication system
US20040160950A1 (en) * 2003-02-14 2004-08-19 Nokia Corporation Method for ensuring adequacy of transmission capacity, terminal employing the method, and software means for implementing the method
US7804827B2 (en) * 2003-02-14 2010-09-28 Nokia Corporation Method for ensuring adequacy of transmission capacity, terminal employing the method, and software means for implementing the method
US8077731B2 (en) * 2003-12-09 2011-12-13 Alcatel Lucent Method and system for packet-based tandem free operation
US20070230467A1 (en) * 2003-12-09 2007-10-04 Alcatel Wireless, Inc. Method and System for Packet-Based Tandem Free Operation
US20060212289A1 (en) * 2005-01-14 2006-09-21 Geun-Bae Song Apparatus and method for converting voice packet rate
US20070121572A1 (en) * 2005-11-30 2007-05-31 Francesco Agnoni Systems and Methods for tandem free operation signal transmission
US8300622B2 (en) * 2005-11-30 2012-10-30 Telefonaktiebolaget Lm Ericsson (Publ) Systems and methods for tandem free operation signal transmission
US20120284021A1 (en) * 2009-11-26 2012-11-08 Nvidia Technology Uk Limited Concealing audio interruptions

Also Published As

Publication number Publication date Type
EP1315388B9 (en) 2015-07-22 grant
DK2265084T3 (en) 2015-05-04 grant
EP2265084B1 (en) 2015-02-25 grant
DK2265085T3 (en) 2015-05-04 grant
DK0864237T4 (en) 2011-02-14 grant
DE19544367A1 (en) 1997-06-05 application
EP2265085A2 (en) 2010-12-22 application
ES2533986T3 (en) 2015-04-16 grant
EP2276312A3 (en) 2011-07-20 application
US6785557B2 (en) 2004-08-31 grant
EP2276312A2 (en) 2011-01-19 application
EP0864237A1 (en) 1998-09-16 application
JP2000500941A (en) 2000-01-25 application
CA2243678A1 (en) 1997-06-05 application
DE19650141A1 (en) 1998-06-10 application
DK864237T3 (en) grant
EP0847211B1 (en) 2013-01-16 grant
EP1315388A2 (en) 2003-05-28 application
EP1315388A3 (en) 2013-01-23 application
EP2265085B1 (en) 2015-02-25 grant
ES2401181T3 (en) 2013-04-17 grant
ES2194117T3 (en) 2003-11-16 grant
EP1315388B1 (en) 2015-02-25 grant
EP0847211A3 (en) 2000-01-12 application
DK1315388T3 (en) 2015-04-27 grant
WO1997020440A1 (en) 1997-06-05 application
EP2265084B9 (en) 2015-07-22 grant
DE19650140A1 (en) 1998-06-10 application
DK0864237T3 (en) 2003-05-05 grant
US20030195011A1 (en) 2003-10-16 application
ES2534298T3 (en) 2015-04-21 grant
EP0864237B1 (en) 2003-03-05 grant
EP0847211A2 (en) 1998-06-10 application
ES2194117T5 (en) 2011-05-09 grant
DE59610201D1 (en) 2003-04-10 grant
JP3847345B2 (en) 2006-11-22 grant
DK0847211T3 (en) 2013-04-02 grant
EP0864237B2 (en) 2011-01-05 grant
EP2265084A3 (en) 2013-05-15 application
EP2265084A2 (en) 2010-12-22 application
DE19650140B4 (en) 2016-10-27 grant
CA2243678C (en) 2004-05-11 grant
ES2534297T3 (en) 2015-04-21 grant
EP2265085A3 (en) 2013-05-15 application

Similar Documents

Publication Publication Date Title
US5757810A (en) Transmission link supervision in radiocommunication systems
US6138020A (en) Quality-based handover
US5757792A (en) Mobile communication system and a method of communication mode transition
US5768308A (en) System for TDMA mobile-to-mobile VSELP codec bypass
US6061566A (en) Mobile communication system and call control method
USH1880H (en) System and method for processing wireless voice and data telecommunications
US6256612B1 (en) End-to-end coder/decoder (codec)
US5511072A (en) Method, terminal and infrastructure for sharing channels by controlled time slot stealing in a multiplexed radio system
US6125110A (en) Method and system for determining a packet transmission order
US5491719A (en) System for handling data errors on a cellular communications system PCM link
US6205125B1 (en) Method and system for determining an estimate of a transmission time of a packet
US6091969A (en) Method and apparatus for inband signaling control of vocoder bypass
US6928289B1 (en) Device and method for communicating packet voice data in mobile communication system
US6647006B1 (en) High-speed data transmission in a mobile system
US6879599B1 (en) Mapping of transcoder/rate adaptor unit protocols onto user datagram protocols
US20030135376A1 (en) Control of speech code in mobile communications system
US7203226B1 (en) Methods and apparatus for data communication
US6754265B1 (en) VOCODER capable modulator/demodulator
US5991716A (en) Transcoder with prevention of tandem coding of speech
US6047007A (en) Transmission of data on multirate networks
US5430724A (en) TDMA on a cellular communications system PCM link
US20020049860A1 (en) Tone detection elimination
US7483418B2 (en) Data and voice transmission within the same mobile phone call
US20030032440A1 (en) Multipoint communication method and communication control device
US6272358B1 (en) Vocoder by-pass for digital mobile-to-mobile calls

Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MAYER, RALF;REEL/FRAME:009569/0437

Effective date: 19980416

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

AS Assignment

Owner name: KAROLS DEVELOPMENT CO LLC, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IPCOM GMBH & CO. KG;REEL/FRAME:030144/0766

Effective date: 20080403

AS Assignment

Owner name: IPCOM GMBH & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROBERT BOSCH GMBH;REEL/FRAME:030246/0005

Effective date: 20070523

AS Assignment

Owner name: KAROLS DEVELOPMENTCO LLC, NEW YORK

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE TYPE OF DOCUMENT PREVIOUSLY RECORDED ON REEL030144, FRAME 0766. ASSIGNORS HEREBY CONFIRMS THE DOCUMENT SHOULD HAVE BEEN SUBMITTED AS A SECURITY AGREEMENT NOT AN ASSIGNMENT;ASSIGNOR:IPCOM GMBH 7 CO. KG;REEL/FRAME:030407/0253

Effective date: 20080403

AS Assignment

Owner name: LANDESBANK BADEN-WUERTTEMBERG, GERMANY

Free format text: SECURITY AGREEMENT;ASSIGNOR:IPCOM GMBH & CO. KG;REEL/FRAME:030571/0649

Effective date: 20130607

FPAY Fee payment

Year of fee payment: 12